why does finalize not get fired when i try to destroy a class until the application is exiting. i feel like because these objects were never actually finalized until the program is exiting that its somehow bogging down the operation of my app VS 2008?
View 1 RepliesI have a logging class that stores entries in a datatable dt. I then use SQLBULKCOPY to write that dt out to a sql table. Basic stuff. Problem is, I'd like to only call SQLBULKCOPY when there's say 50 entries in the dt. The problem is, what if I'm done (either intentionally or not, like if the code block that's using the log class throws an exception) with the logging object and there are still 15 rows in the dt?
View 1 RepliesI have a class that is stored after serialization and compression.Is there any event built in the class that is fired automatically when a class is deserialized and ready to be used??
View 1 Repliesthis used to be so easy in C++ and VB6 I am dynamically creating multiple instances of a fairly simple class, tracking them via the Collections class in vb.net. I loop through the collection if I need to get to a particular instance to set some property, for example. Everything is fine, and works ok until I try to destroy the instances that I created (largely because I am probably not doing it right). What I am doing setting the instance to "nothing". That is, here is the portion of the code:
[Code]...
I have a class that has timers and logic that I want to "Kill". Performing a TestClass = Nothing does not destroy it (calling it form a form).
View 3 RepliesI am writing a chat application quite similar to MSN and others alike, where you have a main window that can spawn several chat windows.So I have a chat class form (called frmChat) that I just instantiate whenever I need it, with the following code from the main form:[code]In this form I have a button labeled as 'End chat'. I would like not just to close the form, but actually to destroy its instance in order to dispose memory. I tried what would seemed to be to me the more direct and obvious way to do that (see below), but unfortunatelly VB syntax checker doesn't allow me to do that:[code]
View 3 RepliesI'm having an issue where my main form isn't updating even though I see the event fire off. Let me explain the situation and share some of my code which I'm sure will be horrible since I'm an amateur. I created a class to take in the settings for running a process in the background. I add some custom events in that class so I could use that in my form instead of a timer.
[Code]...
the application I am developing does not exit completely. i.e. the process can be seen in the Task manager. This happens only when I click on the [X] button on the title bar of the window of my MDI form. If I use the File >> Exit in the menu of my application, it exits without leaving any traces. I have used the "End" method there. But the process stays when I click the [X] on the control box on the title bar.
View 6 RepliesWe have an application that works well on XP/Pro, Vista, Windows 7, Windows 2003 Server, Windows 2008 Server (32 bit) but is problematic on Windows 2008 Server (64 bit). The application uses an unsigned activeX control which may or may not be related to the problem. To install we need to add the program name and regsvr32 as DEP exceptions. Once that is done the application installs correctly and operates normally except when the application closes.
If a user clicks the 'exit' button our code basically says 'unload me' (where me = the main form of the application) and there is no code in the form_unload section of the program.
Everything works well on every Windows platform except Win 2008 64 bit where we get
APPCRASH
Application Name: PDFPrint.exe
Application Version: 10.10.0.18
Application Timestamp: 4d238253
[Code].....
After we continue to close the program we see a message box with run time error 216 at 00002B24 message.
I am trying to do the following check to see if the user presses the Cancel button or the exit application (X). But for some reason it is not working. Can anyone let me know what am I doing wrong?
CheckCancel
If NewStationInfo.CancelButton.DialogResult = Windows.Forms.DialogResult.OK Then
do sometheing
[code].....
(1) I've read a lot of questions about IDisposable where the answers recommend not using Finalize unless you really need to because of the process time involved.What I haven't seen is how much this cost is and how often it's paid. Every millisecond? second? hour, day etc.
(2) Also, it seems to me that Finalize is handy when its not always known if an object can be disposed. For instance, the framework font class. A control can't dispose of it because it doesn't know if the font is shared. The font is usually created at design time so the user won't know to dispose it, therefore finalize kicks in to finally get rid of it when there are no references left. Is that a correct impression?
when i call GC.ReRegisterForFinalize(obj) and changed my mind, i could call GC.SuppressFinalize(obj) and remove it from the list of object that requests finalization. problem is that when i call GC.ReRegisterForFinalize(obj) twice, it registers the object twice in the finalization-listing. i need to remove the object from the finalization-listing but multiple calls of GC.SuppressFinalize(obj) could not remove obj from the list.also, why is it acceptable for this function to be called SuppresFinalize when after calling it Finalize still occurs?
View 2 RepliesClass ComponentsContainer ' a component contains other components'
Inherits System.ComponentModel.Component
Private foo as New Component
Private bar as New Component
Protected Override Sub Finalize()
foo.Dispose() ' HERE ? '
bar.Dispose()
MyBase.Finalize()
End Sub
Protected Overrides Sub Dispose(disposing As Boolean)
[Code]...
I'm looking at some vb.net code I just inherited, and cannot fathom why the original developer would do this.
Basically, each "Domain" class is a collection of properties. And each one implements IDisposable.Dispose, and overrides Finalize(). There is no base class, so each just extents Object.
Dispose sets each private var to Nothing, or calls _private.Dispose when the property is another domain object. There's a private var that tracks the disposed state, and the final thing in Dispose is GC.suppressFinalize(Me)
Finalize just calls Me.Dispose and MyBase.Finalize.
There are no un-managed resources, no db connections, nothing that would seem to need this.
Is there a way to Finalize() or Dispose() a Module in VB.NET? Have a situation similar to the following and need to Dispose() itsUnManagedObject.[code]...
View 2 Replieshow do we implement Finalize to remove an object?i tried this:
Public Sub kill()
Me.Finalize()
End Sub
then this:
Dim g = New Test
g.kill()
MsgBox(g.ToString)
weird the object still exists, i don't get a NullReferencePointer exception
I am comparing an alternative Dispose pattern to VS2005's default implementation. In doing the comparison I have found several uncertainties with the default pattern which have raised a handful of questions related to sub-class implementations and object Finalization.
[Code]...
A have written an activex exe (let say FileCopy.exe. I want that obect itself can be destroyed from the class.
suppose an application creates a component from the class "FileCopy"
Set NewFile =CreateObject ("FileCopy.Filops")
Is it possbile the application quits and object is still running in separate space and We can destry it (Filops) based on certain condition (let say timeout) from its own code (Filops).[code]..
I programatically add a group of UserControls to a flowLayoutPanel control.
sometimes I need to destroy that group of controls, but have no idea on how to do it.
assigning the flowLayoutPanel variable to nothing only erases the pointer, but the controls remain in the window.I have found a page in MSDN saying that the best way to destroy a control is to call the DestroyWindow API, to destroy the container window. But I don't want to destroy the container window.
I have a function like the following: Public Function testFunction(ByVal input_string As String) As String
[Code]...
or just let the garbage collector do the job for us? Both the above functions work, but I want only know the best practice for performance...
Here is the situation: User logs in via username/password stored in an MSSQL database If the user is authenticated, the system makes a session variable with username/SHA1'd password and boolean if the user is logged in or not (for subsequent pages) I need to be able to destroy the session variable. I want a confirmation box as well.
This is what I have so far:
<script type="text/javascript">
//<![CDATA[
function doLogout() {
[CODE]...
Since it is an ajax request won't reload the page (the functionality works fine, the request destroys the session), I think I need a different approach to do this. I would really like to be able to do it all in ASP.NET if possible.
As the title states, I have a session variable that is set during a login script with asp.net and vb.net code-behind. Can I call a javascript function when a link is clicked that will destroy that session variable? If it is possible, can I use jQuery to make that process easier?
View 4 RepliesI'm developing an app which creates like 30 labels at runtime.The problem is that with the click of a button, I need to destroy those created labels.[code]...
View 17 RepliesI migrate a project from vb 6.0 to vb.net 2008.
[Code]...
When the form first loads there are two global variables (assigned values in the form load sub as a default) that set the number of days back in time and how many days ahead events will be displayed (in an array of labels). If the user wants to view more events (or less events) the number of labels displayed (and the text they contain) will change. I have one sub (code below)that creates an array of labels.
[Code]...
Deleting a file is one of the controversial matters of computing. When a user deletes a file (removing it also from the Recycle Bin), they assume that the file is indeed deleted. However, what happens is that only the reference to that file is deleted, so the system can no longer remember where the file is located, but the file itself is very much intact.
I am looking for a way to delete a file permanently, the way e.g. the application Wipefile would do it, by applying successive overwrites (up to 30) over the actual position of the file on the disk. There must be a way to do this through code (I just presented an example that this has indeed been done ), so I'd like to know how to do it.
Im new to visual basic but i have some experiance in other languages.I been trying to build an application that uses the webbrowser module.There is only 1 thing i cant find anywhere.in my app i use my browser to signup at a sertain webpage.This page remembers my login info.When i close my application and open it again and go to the same page i can login again.But when i switch forms and go back to the browser form it will automatical login for me.
View 4 RepliesUsing vb.net 2008 I have a form with a PDFViewer control. I pass the filename and path to open the pdf. When the form is closed, AcroRd32.exe is not destroyed. It remains in Task Manager even after I've completely closed the application. The more pdf files I open, the more memory used. How can I destroy? I've tried setting the control = nothing, ctrl.dispose but neither is working. What am I doing wrong?
View 5 RepliesI've previously posted with regards to searching for a string within Excel, although the replies were enough to get my application 'working' the solution was riddled with over-complicated methods.Therefore I bought some books and figured it out for myself and came up with the below (which works like a charm may I add).
Dim oExcel As New Microsoft.Office.Interop.Excel.Application
Dim oBook As Microsoft.Office.Interop.Excel.Workbook
Dim oSheet As Microsoft.Office.Interop.Excel.Worksheet
[code]....
None of these (even if combined) make ANY effect whatsoever.I have also saved the workbook on exit, again to no avail.
Trying to exit an application but can't seem to kill it without an error."An error occurred creating the form. See Exception.InnerException for details. The error is: The form referred to itself during construction from a default instance, which led to infinite recursion. Within the Form's constructor refer to the form using 'Me.'"The form hasn't loaded yet, it is still in the process of looking for a file to load, if the user doesn't want to specify a working directory, that is their choice, but I need to close the app since it can't continue without it.I'm stuck in a class and can't get back to the main form without it continuing to load everything up. I wan't to force a shut down. [code] I was trying to get back to the main form without loading any more from the class to kill it there. [code]
View 6 Replies